alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Scala example source code file (bug978.scala)

This example Scala source code file (bug978.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

any, app, app, boolean, boolean, foo, foo, for, int, int, test

The Scala bug978.scala source code

class Foo(val n: Int) {
  override def hashCode = n % 2 // pretty bad hash
  override def equals(other: Any): Boolean = other match {
    case f: Foo => f.n == n
    case _ => false
  }

  override def toString = "" + n
}

object Test extends App {
  val set = new collection.mutable.HashSet[Foo]
//  val set = new collection.jcl.HashSet[Foo]

  val max = 200
  for (x <- 1 to max)
    set += new Foo(x)

  testRemove(2)
  testExists(2)

  def testRemove(m: Int) {
    for (x <- 1 to max; if x % m == 0) {
      val f = new Foo(x)
      set -= f
      assert(!(set contains f))
      testExists(m)
    }
  }

  def testExists(m: Int) {
    for (x <- 1 to max; if x % m == 1) {
      val f = new Foo(x)
      assert(set contains f, "For element: " + f + " set: " + set)
    }
  }

}

Other Scala examples (source code examples)

Here is a short list of links related to this Scala bug978.scala source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.